Lanair HI320 - Manual (Page 60)

Section 17 Trouble Shooting Flow Chart #4
"Caution: Hazard Of Electrical Shock"
Symptoms:
1. Preheater cold with preheater switch on?
2. Burner attempts to fire but fails?
3. Unable to establish a flame?
4. Oil Primary locks out?
5. Preheater switch on, is the preheater switch light on?
No
Yes
Is there voltage (115V) to the preheater switch?
No
Replace preheater switch.
Is there voltage (115V) going to the heating
elements from the snap switch?
Yes
No
Replace snap switch, or repair loose wire
connections.
Does the 1/4" Dia. heating element have
Internal resistance of 112 OHMS ±10,
at room temperature?
Yes No
Does the 3/8" Dia. heating
Replace 1/4" heating element.
element have internal resistance of
37 OHMS ±10% at room temperature.
Yes
No
Check for loose wire
Replace 3/8" heating element.
connections and repair.
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